I also have a D54250WYK that freezes on the Intel NUC boot screen (which normally shows the "press key for boot options" note in the lower right, but doesn't when it freezes) when a USB 3.0 device is plugged in. I'm running Ubuntu 14.04 with 16GB RAM and bios version 26:
$ sudo dmidecode -s bios-version
WYLPT10H.86A.0026.2014.0514.1714
Curiously this issue only manifests when I reboot the NUC. If I power down completely, give it a second, then power up it boots flawlessly. I can post a video if there's interest.
I've seen other threads where bios updates have been posted which purport to solve this issue, please release a fix for the D54250WYK.